Postnatal developmental profile of 3-hydroxy-3-methylglutaryl-CoA reductase, squalene synthetase and cholesterol 7 alpha-hydroxylase activities in the liver of domestic swine.
Activities of 3-hydroxy-3-methylglutaryl-CoA reductase, squalene synthetase and cholesterol 7 alpha-hydroxylase, measured in liver microsomal preparations from domestic swine between birth and adolescence, correlated strongly in individual animals. A synchronous increase was observed between 4 and 6 weeks after birth, i.e., immediately after weaning. Rise in activity was highest for HMG-CoA reductase (30-fold), and smallest for squalene synthetase (5-fold). In pubertal pigs (16 to 30 weeks old), activities of these enzymes had the same low values as in suckling piglets. The increase of both HMG-CoA reductase and squalene synthetase activities may be caused by the shift from high-cholesterol milk intake to a chow diet with low-cholesterol content. The rise in cholesterol 7 alpha-hydroxylase activity might be due to other dietary or hormonal factors.
Kwekkeboom
J
J
Gaubius Institute T.N.O., Leiden, The Netherlands.
Kempen
H J
HJ
van Voorthuizen
E M
EM
Griffioen
M
M
Cohen
L H
LH
D000818:Animals; D002790:Cholesterol 7-alpha-Hydroxylase / Q000378:metabolism*; D013186:Farnesyl-Diphosphate Farnesyltransferase / Q000378:metabolism*; D005260:Female; D006903:Hydroxymethylglutaryl CoA Reductases / Q000378:metabolism*; D008862:Microsomes, Liver / Q000201:enzymology*; D010088:Oxidoreductases / Q000378:metabolism*; D013250:Steroid Hydroxylases / Q000378:metabolism*; D013552:Swine
D010088:Oxidoreductases; D006903:Hydroxymethylglutaryl CoA Reductases; D013250:Steroid Hydroxylases; D002790:Cholesterol 7-alpha-Hydroxylase; D013186:Farnesyl-Diphosphate Farnesyltransferase